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//go:build stm32f4 && stm32f407
// +build stm32f4,stm32f407
package runtime
import "device/stm32"
/*
clock settings
+-------------+--------+
| HSE | 8mhz |
| SYSCLK | 168mhz |
| HCLK | 168mhz |
| APB2(PCLK2) | 84mhz |
| APB1(PCLK1) | 42mhz |
+-------------+--------+
*/
const (
HSE_STARTUP_TIMEOUT = 0x0500
// PLL Options - See RM0090 Reference Manual pg. 95
PLL_M = 8 // PLL_VCO = (HSE_VALUE or HSI_VLAUE / PLL_M) * PLL_N
PLL_N = 336
PLL_P = 2 // SYSCLK = PLL_VCO / PLL_P
PLL_Q = 7 // USB OTS FS, SDIO and RNG Clock = PLL_VCO / PLL_Q
PLL_CFGR = PLL_M | (PLL_N << stm32.RCC_PLLCFGR_PLLN_Pos) | (((PLL_P >> 1) - 1) << stm32.RCC_PLLCFGR_PLLP_Pos) |
(1 << stm32.RCC_PLLCFGR_PLLSRC_Pos) | (PLL_Q << stm32.RCC_PLLCFGR_PLLQ_Pos)
)
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